Ryan Carson

A user reports noticing a significant performance speed-up in Codex 5.3 on the CLI, comparing the experience to Spark, and asks if others have observed the same improvement.

I'm seeing a massive speed up of Codex 5.3 right now on the CLI. 

Has anyone else seen that? 

It almost feels like Spark.

<p>I'm seeing a massive speed up of Codex 5.3 right now on the CLI. 

Has anyone else seen that? 

It almost feels like Spark.</p>

A developer shares a casual discovery that Codex CLI had quietly added support for OpenAI's Spark model, and they had been using it without realizing. They note that Spark on Medium setting is impressively fast for iterating on frontend UI, describing the speed as almost instant.

lol turns out I was on Spark in the CLI and didn't realize it.

I rebooted Codex CLI and they must've added Spark support and I didn't check which model I was on.

Spark on Medium is sooo good for iterating on frontend UI.

It's almost instant - doesn't feel possible. https://t.co/H5t86JrjKK

<p>lol turns out I was on Spark in the CLI and didn't realize it.

I rebooted Codex CLI and they must've added Spark support and I didn't check which model I was on.

Spark on Medium is sooo good for iterating on frontend UI.

It's almost instant - doesn't feel possible. https://t.co/H5t86JrjKK</p>